find number of term in the AP A. 100 , 98 , .......... 6 , 4
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Step-by-step explanation:
a = 100, d = -2, n = ?, aₙ = 4
aₙ = a + (n-1)d
4 = 100 + (n-1) × (-2)
=> 4 = 100 - 2n + 2
=> 4 = 102 - 2n
=> 2n = 102 - 4
=> 2n = 98
=> n = 98/2 = 49
therefore there are 49 terms in the given A.P
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