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Binomial Theorem question

2022 · 24 Jun · Shift 1 · Q23
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  5. /2022 · 24 Jun · Shift 1 · Q23

Binomial Theorem question

2022 · 24 Jun · Shift 1 · Q23

JEE MainMathematicsBinomial TheoremMCQ+4 / −1
The remainder when 32022 is divided by 5 is :
  1. A
    1
  2. B
    2
  3. C
    3
  4. D
    4
View written solutionFree

Correct answer: D

  1. We need the remainder when 320223^{2022}32022 is divided by 555.

  2. Find the pattern of powers of 333 modulo 555:

    31≡3(mod5)3^1 \equiv 3 \pmod{5}31≡3(mod5) 32=9≡4(mod5)3^2 = 9 \equiv 4 \pmod{5}32=9≡4(mod5) 33=27≡2(mod5)3^3 = 27 \equiv 2 \pmod{5}33=27≡2(mod5) 34=81≡1(mod5)3^4 = 81 \equiv 1 \pmod{5}34=81≡1(mod5)

    So the remainders repeat every 444 powers: 3,4,2,1,3,4,2,1,…3,4,2,1,3,4,2,1,\dots3,4,2,1,3,4,2,1,…

  3. Now divide the exponent 202220222022 by 444: 2022=4×505+22022 = 4 \times 505 + 22022=4×505+2

    Hence, 32022=34⋅505+2=(34)505⋅323^{2022} = 3^{4\cdot 505 + 2} = (3^4)^{505} \cdot 3^232022=34⋅505+2=(34)505⋅32

  4. Taking modulo 555: 34≡1(mod5)3^4 \equiv 1 \pmod{5}34≡1(mod5) Therefore, 32022≡1505⋅32≡9≡4(mod5)3^{2022} \equiv 1^{505} \cdot 3^2 \equiv 9 \equiv 4 \pmod{5}32022≡1505⋅32≡9≡4(mod5)

  5. So the remainder is 444.

  6. Checking options:

    • A: 111 ❌
    • B: 222 ❌
    • C: 333 ❌
    • D: 444 ✅

Therefore, the correct option is D.

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