If 7 times the 7th term of an A.P is equal to 11 times its eleventh term, find the 18th term of the A.P Options: A . &nbsp0 B . &nbsp3 C . &nbsp5 D . &nbsp6 E . &nbspNone of these

If 7 times the 7th term of an A.P is equal to 11 times its eleventh term, find

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If 7 times the 7th term of an A.P is equal to 11 times its eleventh term, find the 18th term of the A.P

Answer: Option A

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Bharath daniel 2017-03-14 04:17:39

7t7 = 11t11
7(7 +(7-1)d = 11(11+(11-1)d)
49+42d = 121+110d
110d-42d= 121-49
68d = 72

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