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Q1)

Q2)

Thanks!

 Mar 27, 2019
 #1
avatar+102417 
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First one

 

[ first term  +  last term ] * number of terms   / 2

 

first term  = 3(1)   = 3

last term  = 3(5)   = 15

 

Sum    =   [ 3 + 15 ]  * (5)   / 2 =    18 * 5 / 2 =     45

 

 

Second one....     

                                                                       

first term  =  2(1)^2  - 4 =    -2

second term = 2(2)^2 - 4 = 4

third term = 2(3)^2 - 4 = 14

last term  =  2(4)^2 - 4=      28

 

Sum  =  44

 

 

 

cool cool cool

 Mar 27, 2019

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