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प्रश्न
Find:
v) the 15the term of the AP - 40,- 15,10,35,.........
उत्तर
The given AP is - 40,- 15, 10 , 35,.........
First term, a = -40
Common difference, d = -15 - (-40) =25
nth term of the AP` a_n = a +(n-1) d = -40 + (n-1) xx 25`
∴ 15th term of the AP ` a_15 = -40 + (15-1) xx 25 = -40 + 350 = 310`
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