please..................50 marks
Attachments:
Answers
Answered by
2
☆☞ Here is ur answer ☜☆
☆☞ 24n – 15n – 1
= (24)n – 15n – 1
= 16n –15n – 1
= (1 + 15)n – 15n – 1
= [ nCo + nC1 (15) + nC2 (15)2 + nC3(15)3+ ........+ nCn (15)n] – 15n – 1
= [ 1 + 15n + nC2 (15)2 + nC3(15)3 + ....+ nCn (15)n ] – 15n – 1
= nC2 (15)2 + nC3 (15)3 + ...... nCn(15)n
= (15)2 [ nC2 + nC3 (15) + ....+ nCn(15)n – 2 ]
= 225 × A positive integer
∴ 24n – 15n – 1 is divisible by 225.
HOPE IT HELPS!!!
@BINDASSBOY
Answered by
1
Answer:
☆☞ Here is ur answer ☜☆
☆☞ 24n – 15n – 1
= (24)n – 15n – 1
= 16n –15n – 1
= (1 + 15)n – 15n – 1
= [ nCo + nC1 (15) + nC2 (15)2 + nC3(15)3+ ........+ nCn (15)n] – 15n – 1
= [ 1 + 15n + nC2 (15)2 + nC3(15)3 + ....+ nCn (15)n ] – 15n – 1
= nC2 (15)2 + nC3 (15)3 + ...... nCn(15)n
= (15)2 [ nC2 + nC3 (15) + ....+ nCn(15)n – 2 ]
= 225 × A positive integer
∴ 24n – 15n – 1 is divisible by 225.
Similar questions