Find the Sum,m $\mathrm { s } _ { \mathbf { n } },$

question 152

Multiple Choice

Find the sum,m, $\mathrm { s } _ { \mathbf { n } },$ , o f the sequence.
- $a _ { 1 } = 8 , d = 10 ; \text { find } \mathrm { s } _ { 5 }$

• A)90
• B)140
• C)280
• D)54

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