गणित श्रेढीतील तिसरी संख्या 0 असेल आणि सातवी संख्या 8 असेल तर पंधरावी संख्या काय
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Step-by-step explanation:
a+2d = 0
a+7d = 8
by solving the equation
a+2d = 0
- a+ 7d = 8
__________
-5d = -8
d = 8/5
put in above equation
a +2*8/5 = 0
a+16/5 =
a = 16/5
so, t 15= a+14d
= 16/5 + 14 * 8/5
= 16/5 + 112/5
= 128 /5
= 25.6
T 15 = 25.6
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