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Find 8th term of the A.P. 117,104,91,78,.... |
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Answer» Given A.P is 117,104,91,78,..... first term of this A.P is a1 = 117 second term of this A.P is a2 = 104 common difference of an A.P is given by (i.e., d = an+1−an) putting n = 1 in above equation d = a2−a1 = 104−117 = −13 hence common difference for this A.P is d = −13 the nth term of an A.P is given by. an=a1+(n−1)d ⟹an=117+(n−1)(−13) ⟹an=117−13n+13 ⟹an=130−13n....eq(1) for finding 10th term (a8)of this A.P put n=8 in above eq(1) ⟹a8=130−13×8 ⟹a8=130−104 ⟹a8=26 |
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