find the sum of odd numbers between 20 and 200
Answers
Answered by
2
Answer:
odd numbers beteen 20 and 200 are 21 ,23,25,27,29,........199
199 = 21 +(n-1)2
199-21 =(n-1)2
178/2 = n-1
89+1=n ::n=90
sum =45 × (21 + 89×2)
= 45 × (21 +178)
= 45× 199
=8955
Answered by
1
Answer:
21+23+25+27+29+31+33+35+37+39+41+43+45+47+49+51+53+55+57+59+61+63+65+67+69+71+73+75+77+79+81+83+85+87+89+91+93+95+97+99+101+103+105+107+109+111+113+115+117+119+121+123+125+127+129+131+133+135+137+139+141+143+145+147+149+151+153+155+157+159+161+163+165+167+169+171+173+175+177+179+181+183+185+187+189+191+193+195+197+199=9900
hope it helps you..
remember to mark it as brainlist answer....
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