The sum of first 20 terms of theA.P.12,15,18,....is समांतर

1.	The sum of first 20 terms of theA.P.12,15,18,....is समांतर श्रेणी12,15,18,.... के प्रथम 20 पदो का योग है।
Answer» Answer: we have a = 12 d = 3 N = 20 now we know that Sn = n/2( 2a + (n-1)d) S20 = 20/2(2×12+(20-1)3) = 10(24 + 47) = 10(71) =. 710

The sum of first 20 terms of theA.P.12,15,18,....is समांतर श्रेणी12,15,18,.... के प्रथम 20 पदो का योग है।

Answer»

Answer:

we have a = 12

d = 3

N = 20

now we know that

Sn = n/2( 2a + (n-1)d)

S20 = 20/2(2×12+(20-1)3)

= 10(24 + 47)

= 10(71)

=. 710

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The sum of first 20 terms of theA.P.12,15,18,....is समांतर श्रेणी12,15,18,.... के प्रथम 20 पदो का योग है।​

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The sum of first 20 terms of theA.P.12,15,18,....is समांतर श्रेणी12,15,18,.... के प्रथम 20 पदो का योग है।